Analysis of current gearing:

Change your gearing or your personal info and see what effect it has by clicking on 'Recalculate'.
Open this analysis in another webpage for printing

Personal info:

Body weight (kg):

Bicycle weight (kg):

Max power (watt):

Coefficient KA:

Want to climb: 1 in

Headwind (mph):

Coefficient CR:

Gradient: 1 in

0 = no Gradient

Low gear, hill climb - what's the steepest hill you can climb within this cadence range?

Your lowest overall gear ratio is lowestgearing and at your optimal cadence of optimum cadence rpm this equates to mph mph.
At this speed the power lost through air resistance is lost power watts and the power lost through other types of frictional resistance is lost power watts.
At this rpm and speed, you can climb a 1 in one in hill with your max power of your max watts.
You want to climb a hill of 1 in your hill and to do this at this speed / cadence you need to produce hill watts watts to overcome the gradient giving a total of needed watts watts.

Speeds on flat ground at optimal cadence with power required

Headwind (above) is included in this calculation.

Speeds on above gradient at optimal cadence with power required

Headwind (above) is included in this calculation.

Analysis of each gear combination

Analysis of each MPH point - which gear combinations could you use at this MPH and remain within cadence range?

There has been much scientific research on optimum cadence. For most people a cadence of 60 to 100 rpm is a comfortable range,
with some sources measuring maximum power at 85 rpm and others at 90 - 95 rpm. You can measure your own preferred cadence.
Zip tie a cheap watch (or a speedo with a timer) to your handlebars and count how many times your pedals rotate when you are pedalling hard.
Factors are the degree of fitness of the rider and the degree to which efficiency or peak power are important.

Use the chart above to choose your ideal gearing.

Assume that as far as possible you need to pedal in the green area (which you set to your cadence range)
with max comfort and power in the region of deeper green.